mirror of https://github.com/freetype/freetype
[autofit] Implement vertical separation adjustment.
* src/autofit/aflatin.c: Include `afadjust.h`. (af_latin_metrics_init): Call `af_reverse_character_map_new`. (af_latin_metrics_done): New function. (af_move_contour_vertically, af_check_contour_horizontal_overlap, af_glyph_hints_apply_vertical_separation_adjustments): New functions. (af_latin_hints_apply): Call `af_glyph_hints_apply_vertical_separation_adjustments`. (af_latin_writing_system_class): Updated. * src/autofit/aftypes.h (AF_StyleMetricsRec): Add `reverse_charmap` field.
This commit is contained in:
Craig White
Werner Lemberg
parent
c70b3d9484
commit
1e5e193adb
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@ -22,6 +22,7 @@
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#include "afglobal.h"
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#include "aflatin.h"
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#include "aferrors.h"
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#include "afadjust.h"
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/**************************************************************************
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@ -1155,6 +1156,9 @@
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af_latin_metrics_check_digits( metrics, face );
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}
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af_reverse_character_map_new( &metrics->root.reverse_charmap,
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metrics->root.globals );
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Exit:
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face->charmap = oldmap;
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return error;
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@ -1484,6 +1488,17 @@
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}
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FT_CALLBACK_DEF( void )
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af_latin_metrics_done( AF_StyleMetrics metrics_ )
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{
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AF_LatinMetrics metrics = (AF_LatinMetrics)metrics_;
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af_reverse_character_map_done( metrics->root.reverse_charmap,
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metrics->root.globals->face->memory );
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}
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/* Scale global values in both directions. */
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FT_LOCAL_DEF( void )
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@ -2737,6 +2752,304 @@
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}
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#undef FT_COMPONENT
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#define FT_COMPONENT afadjust
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static void
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af_move_contour_vertically( AF_Point contour,
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FT_Int movement )
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{
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AF_Point point = contour;
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AF_Point first_point = point;
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if ( point )
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{
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do
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{
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point->y += movement;
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point = point->next;
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} while ( point != first_point );
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}
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}
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/* Return 1 if the given contour overlaps horizontally with the bounding */
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/* box of all other contours combined. This is a helper for function */
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/* `af_glyph_hints_apply_vertical_separation_adjustments`. */
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static FT_Bool
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af_check_contour_horizontal_overlap( AF_GlyphHints hints,
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FT_Int contour_index )
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{
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FT_Pos contour_max_x = -32000;
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FT_Pos contour_min_x = 32000;
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FT_Pos others_max_x = -32000;
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FT_Pos others_min_x = 32000;
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FT_Int contour;
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FT_Bool horizontal_overlap;
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for ( contour = 0; contour < hints->num_contours; contour++ )
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{
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AF_Point first_point = hints->contours[contour];
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AF_Point p = first_point;
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do
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{
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p = p->next;
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if ( contour == contour_index )
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{
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if ( p->x < contour_min_x )
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contour_min_x = p->x;
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if ( p->x > contour_max_x )
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contour_max_x = p->x;
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}
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else
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{
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if ( p->x < others_min_x )
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others_min_x = p->x;
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if ( p->x > others_max_x )
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others_max_x = p->x;
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}
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} while ( p != first_point );
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}
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horizontal_overlap =
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( others_min_x <= contour_max_x && contour_max_x <= others_max_x ) ||
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( others_min_x <= contour_min_x && contour_min_x <= others_max_x ) ||
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( contour_max_x >= others_max_x && contour_min_x <= others_min_x );
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return horizontal_overlap;
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}
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static void
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af_glyph_hints_apply_vertical_separation_adjustments(
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AF_GlyphHints hints,
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AF_Dimension dim,
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FT_Int glyph_index,
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AF_ReverseCharacterMap reverse_charmap )
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{
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FT_TRACE4(( "Entering"
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" af_glyph_hints_apply_vertical_separation_adjustments\n" ));
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if ( dim != AF_DIMENSION_VERT )
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return;
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if ( af_lookup_vertical_separation_type( reverse_charmap,
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glyph_index ) ==
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AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP &&
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hints->num_contours >= 2 )
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{
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FT_Int highest_contour = -1;
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FT_Pos highest_min_y = 0;
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FT_Pos current_min_y = 0;
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FT_Int contour;
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FT_Bool horizontal_overlap;
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FT_Int adjustment_amount;
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FT_TRACE4(( "af_glyph_hints_apply_vertical_separation_adjustments:\n"
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" Applying vertical adjustment:"
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" AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP\n" ));
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/* Figure out which contour is the higher one by finding the one */
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/* with the highest minimum y value. */
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for ( contour = 0; contour < hints->num_contours; contour++ )
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{
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AF_Point point = hints->contours[contour];
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AF_Point first_point = point;
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if ( !point )
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continue;
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current_min_y = point->y;
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do
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{
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if ( point->y < current_min_y )
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current_min_y = point->y;
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point = point->next;
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} while ( point != first_point );
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if ( highest_contour == -1 || current_min_y > highest_min_y )
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{
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highest_min_y = current_min_y;
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highest_contour = contour;
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}
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}
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/* Check for a horizontal overlap between the top contour and the */
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/* rest. If there is no overlap, do not adjust. */
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horizontal_overlap =
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af_check_contour_horizontal_overlap( hints, highest_contour );
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if ( !horizontal_overlap )
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{
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FT_TRACE4(( " Top contour does not horizontally overlap"
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" with other contours.\n"
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" Skipping adjustment.\n" ));
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return;
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}
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/* If there are any contours that have a maximum y coordinate */
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/* greater than or equal to the minimum y coordinate of the */
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/* previously found highest contour, bump the high contour up until */
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/* the distance is one pixel. */
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adjustment_amount = 0;
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for ( contour = 0; contour < hints->num_contours; contour++ )
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{
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AF_Point point;
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AF_Point first_point;
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FT_Pos max_y;
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if ( contour == highest_contour )
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continue;
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point = hints->contours[contour];
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first_point = point;
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if ( !point )
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continue;
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max_y = point->y;
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do
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{
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if ( point->y > max_y )
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max_y = point->y;
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point = point->next;
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} while ( point != first_point );
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if ( max_y >= highest_min_y - 64 )
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adjustment_amount = 64 - ( highest_min_y - max_y );
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}
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if ( adjustment_amount > 64 )
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FT_TRACE4(( " Calculated adjustment amount %d"
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" was more than threshold of 64. Not adjusting\n",
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adjustment_amount ));
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else if ( adjustment_amount > 0 )
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{
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FT_TRACE4(( " Pushing top contour %d units up\n",
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adjustment_amount ));
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af_move_contour_vertically( hints->contours[highest_contour],
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adjustment_amount );
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}
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}
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else if ( af_lookup_vertical_separation_type( reverse_charmap,
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glyph_index ) ==
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AF_VERTICAL_ADJUSTMENT_BOTTOM_CONTOUR_DOWN &&
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hints->num_contours >= 2 )
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{
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FT_Int lowest_contour = -1;
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FT_Pos lowest_max_y = 0;
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FT_Pos current_max_y = 0;
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FT_Int contour;
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FT_Int adjustment_amount;
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FT_TRACE4(( "af_glyph_hints_apply_vertical_separation_adjustments:\n"
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" Applying vertical adjustment:"
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" AF_VERTICAL_ADJUSTMENT_BOTTOM_CONTOUR_DOWN\n" ));
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/* Find lowest contour. */
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for ( contour = 0; contour < hints->num_contours; contour++ )
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{
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AF_Point point = hints->contours[contour];
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AF_Point first_point = point;
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if ( !point )
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continue;
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current_max_y = point->y;
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do
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{
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if ( point->y > current_max_y )
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current_max_y = point->y;
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point = point->next;
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} while ( point != first_point );
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if ( lowest_contour == -1 || current_max_y < lowest_max_y )
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{
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lowest_max_y = current_max_y;
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lowest_contour = contour;
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}
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}
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adjustment_amount = 0;
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for ( contour = 0; contour < hints->num_contours; contour++ )
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{
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AF_Point point;
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AF_Point first_point;
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FT_Pos min_y;
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if ( contour == lowest_contour )
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continue;
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point = hints->contours[contour];
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first_point = point;
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if ( !point )
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continue;
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min_y = point->y;
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do
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{
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if ( point->y < min_y )
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min_y = point->y;
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point = point->next;
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} while ( point != first_point );
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if ( min_y <= lowest_max_y - 64 )
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adjustment_amount = 64 - ( min_y - lowest_max_y );
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}
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if ( adjustment_amount > 64 )
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FT_TRACE4(( " Calculated adjustment amount %d"
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" was more than threshold of 64. Not adjusting\n",
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adjustment_amount ));
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else if ( adjustment_amount > 0 )
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{
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FT_TRACE4(( " Pushing bottom contour %d units down\n",
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adjustment_amount ));
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af_move_contour_vertically( hints->contours[lowest_contour],
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-adjustment_amount );
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}
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}
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else
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FT_TRACE4(( "af_glyph_hints_apply_vertical_separation_adjustments:\n"
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" No vertical adjustment needed\n" ));
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FT_TRACE4(( "Exiting"
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" af_glyph_hints_apply_vertical_separation_adjustments\n" ));
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}
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#undef FT_COMPONENT
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#define FT_COMPONENT aflatin
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/* Compute the snapped width of a given stem, ignoring very thin ones. */
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/* There is a lot of voodoo in this function; changing the hard-coded */
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/* parameters influence the whole hinting process. */
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@ -3604,6 +3917,11 @@
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af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );
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af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );
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af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );
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af_glyph_hints_apply_vertical_separation_adjustments(
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hints,
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(AF_Dimension)dim,
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glyph_index,
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metrics->root.reverse_charmap );
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}
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}
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@ -3632,7 +3950,7 @@
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(AF_WritingSystem_InitMetricsFunc) af_latin_metrics_init, /* style_metrics_init */
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(AF_WritingSystem_ScaleMetricsFunc)af_latin_metrics_scale, /* style_metrics_scale */
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(AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
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(AF_WritingSystem_DoneMetricsFunc) af_latin_metrics_done, /* style_metrics_done */
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(AF_WritingSystem_GetStdWidthsFunc)af_latin_get_standard_widths, /* style_metrics_getstdw */
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(AF_WritingSystem_InitHintsFunc) af_latin_hints_init, /* style_hints_init */
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@ -439,6 +439,8 @@ extern void* af_debug_hints_;
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AF_FaceGlobals globals; /* to access properties */
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AF_ReverseCharacterMap reverse_charmap;
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} AF_StyleMetricsRec;
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